crepuscular rays Beams of sunlight that are made visible by haze in the atmosphere and are seen where rays penetrate gaps in clouds such as stratocumulus (this effect is called ‘Jacob's ladder’). In other cases rays from a low Sun diverge upwards above cumuliform cloud.

crepuscular rays Beams of sunlight made visible by haze in the atmosphere, and seen where rays penetrate gaps in clouds such as stratocumulus; this effect is called ‘Jacob's ladder’. In other cases rays from a low Sun diverge upwards above cumuliform cloud.